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//! Validation rule checking whether a GraphQL operation contains introspection (`__schema` or
//! `__type` fields).
use crate::{
ast::Field,
parser::Spanning,
validation::{ValidatorContext, Visitor},
value::ScalarValue,
};
/// Validation rule checking whether a GraphQL operation contains introspection (`__schema` or
/// `__type` fields).
pub struct DisableIntrospection;
/// Produces a new [`DisableIntrospection`] validation rule.
#[inline]
#[must_use]
pub fn factory() -> DisableIntrospection {
DisableIntrospection
}
impl<'a, S> Visitor<'a, S> for DisableIntrospection
where
S: ScalarValue,
{
fn enter_field(
&mut self,
context: &mut ValidatorContext<'a, S>,
field: &'a Spanning<Field<S>>,
) {
let field_name = field.item.name.item;
if matches!(field_name, "__schema" | "__type") {
context.report_error(&error_message(field_name), &[field.item.name.span.start]);
}
}
}
fn error_message(field_name: &str) -> String {
format!("GraphQL introspection is not allowed, but the operation contained `{field_name}`")
}
#[cfg(test)]
mod tests {
use super::{error_message, factory};
use crate::{
parser::SourcePosition,
validation::{RuleError, expect_fails_rule, expect_passes_rule},
value::DefaultScalarValue,
};
#[test]
fn allows_regular_fields() {
// language=GraphQL
expect_passes_rule::<_, _, DefaultScalarValue>(
factory,
r#"
query {
user {
name
... on User {
email
}
alias: email
... {
typeless
}
friends {
name
}
}
}
"#,
);
}
#[test]
fn allows_typename_field() {
// language=GraphQL
expect_passes_rule::<_, _, DefaultScalarValue>(
factory,
r#"
query {
__typename
user {
__typename
... on User {
__typename
}
... {
__typename
}
friends {
__typename
}
}
}
"#,
);
}
#[test]
fn forbids_query_schema() {
// language=GraphQL
expect_fails_rule::<_, _, DefaultScalarValue>(
factory,
r#"
query {
__schema {
queryType {
name
}
}
}
"#,
&[RuleError::new(
&error_message("__schema"),
&[SourcePosition::new(37, 2, 16)],
)],
);
}
#[test]
fn forbids_query_type() {
// language=GraphQL
expect_fails_rule::<_, _, DefaultScalarValue>(
factory,
r#"
query {
__type(
name: "Query"
) {
name
}
}
"#,
&[RuleError::new(
&error_message("__type"),
&[SourcePosition::new(37, 2, 16)],
)],
);
}
#[test]
fn forbids_field_type() {
// language=GraphQL
expect_fails_rule::<_, _, DefaultScalarValue>(
factory,
r#"
query {
user {
name
... on User {
email
}
alias: email
... {
typeless
}
friends {
name
}
__type
}
}
"#,
&[RuleError::new(
&error_message("__type"),
&[SourcePosition::new(370, 14, 20)],
)],
);
}
#[test]
fn forbids_field_schema() {
// language=GraphQL
expect_fails_rule::<_, _, DefaultScalarValue>(
factory,
r#"
query {
user {
name
... on User {
email
}
alias: email
... {
typeless
}
friends {
name
}
__schema
}
}
"#,
&[RuleError::new(
&error_message("__schema"),
&[SourcePosition::new(370, 14, 20)],
)],
);
}
}